Crossword Genius

In terms of self-promotion, they are crazy (10)

Ross

I believe the answer is:

egomaniacs

I'm a little stuck... Click here to teach me more about this clue!

'in terms' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.

'self-promotion they are crazy' is the wordplay.
I cannot quite see how this works, but
'self' could be 'ego' (synonyms) and 'ego' is found within the answer.
'are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is found in the answer.
This explanation may well be incorrect...

'of' acts as a link.

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I've seen this clue in The Guardian.
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